SHAFAQNA – The Prophet Moses (AS) became ill and Bani Israel came to visit him. They diagnosed his illness and prescribed an herbal medicine to cure him. Moses (AS) said: I will not take this medicine till God cures me without using it. Moses (AS) was ill for a while until a divine revelation came to him saying: Swear to My magnificence, I will not cure you until you take the prescribed medicine. So, Moses (AS) took the medicine and was cured. Moses (AS) became anxious; the divine revelation came to him saying: You want by your reliance destroy My wisdom and secret of creation, who else placed all these valuable uses in the roots of the plants? .
 Jameâ€™ul Saâ€™adah by Mohammad Mehdi Naraqi, Vol. 3, Page 277.